
 <!DOCTYPE HTML>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  
    <title>玩转Angular2(10)--向表单添加条件控制 | Here. There.</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=3, minimum-scale=1">
    
    <meta name="author" content="被删">
    
    <meta name="description" content="因为项目原因又玩上了Angular2(v4.0+)，《玩转Angular2》系列用于探索一些灵活或者新的用法。本文介绍向表单添加简单的条件控制的过程。">
    
    
    
    
    <link rel="alternate" href="/atom.xml" title="Here. There." type="application/atom+xml">
    
    
    <link rel="icon" href="/img/favicon.ico">
    
    
    <link rel="apple-touch-icon" href="/img/pacman.jpg">
    <link rel="apple-touch-icon-precomposed" href="/img/pacman.jpg">
    
    <link rel="stylesheet" href="/css/style.css">
    
<script type="text/javascript">
var _hmt = _hmt || [];
(function() {
  var hm = document.createElement("script");
  hm.src = "//hm.baidu.com/hm.js?3d902de4a19cf2bf179534ffd2dd7b7f";
  var s = document.getElementsByTagName("script")[0]; 
  s.parentNode.insertBefore(hm, s);
})();
</script>

</head>

  <body>
    <header>
      <div>
		
			<div id="imglogo">
				<a href="/"><img src="/img/sun.png" alt="Here. There." title="Here. There."/></a>
			</div>
			
			<div id="textlogo">
				<h1 class="site-name"><a href="/" title="Here. There.">Here. There.</a></h1>
				<h2 class="blog-motto">Love ice cream. Love sunshine. Love life. Love the world. Love myself. Love you.</h2>
			</div>
			<div class="navbar"><a class="navbutton navmobile" href="#" title="菜单">
			</a></div>
			<nav class="animated">
				<ul>
					
						<li><a href="/">首页</a></li>
					
						<li><a href="https://github.com/godbasin/godbasin.github.io">所有文章</a></li>
					
						<li><a href="/archives">归档</a></li>
					
						<li><a href="/categories">分类</a></li>
					
						<li><a href="/about">关于我</a></li>
					
				</ul>
			</nav>			
</div>

    </header>
    <div id="container">
      <div id="main" class="post" itemscope itemprop="blogPost">
	<article itemprop="articleBody"> 
		<header class="article-info clearfix">
  <h1 itemprop="name">
    
      <a href="/2017/06/23/angular2-free-10-add-conditions/" title="玩转Angular2(10)--向表单添加条件控制" itemprop="url">玩转Angular2(10)--向表单添加条件控制</a>
  </h1>
  <p class="article-author">By
    
      <a href="https://godbasin.github.io" title="被删">被删</a>
    </p>
  <p class="article-time">
    <time datetime="2017-06-23T13:09:03.000Z" itemprop="datePublished">2017-06-23</time>
    更新日期:<time datetime="2018-12-18T15:31:30.868Z" itemprop="dateModified">2018-12-18</time>
    
  </p>
</header>
	<div class="article-content">
		
		
		<div id="toc" class="toc-article">
			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#表单条件"><span class="toc-number">1.</span> <span class="toc-text">表单条件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#常用表单条件"><span class="toc-number">1.1.</span> <span class="toc-text">常用表单条件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#条件判断"><span class="toc-number">1.2.</span> <span class="toc-text">条件判断</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#实例配置"><span class="toc-number">1.3.</span> <span class="toc-text">实例配置</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#带输入的选择"><span class="toc-number">2.</span> <span class="toc-text">带输入的选择</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#带输入的checkbox"><span class="toc-number">2.1.</span> <span class="toc-text">带输入的checkbox</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>因为项目原因又玩上了Angular2(v4.0+)，《玩转Angular2》系列用于探索一些灵活或者新的用法。<br>本文介绍向表单添加简单的条件控制的过程。<br><a id="more"></a></p>
<h2 id="表单条件"><a href="#表单条件" class="headerlink" title="表单条件"></a>表单条件</h2><hr>
<h3 id="常用表单条件"><a href="#常用表单条件" class="headerlink" title="常用表单条件"></a>常用表单条件</h3><p>很多时候，我们的表单需要添加一些条件，例如：</p>
<ul>
<li>选择是否订阅邮件，是则需要填写邮件</li>
<li>针对不同的选择展示不同的表单控件</li>
</ul>
<p>这里我们只考虑比较容易实现的：</p>
<ul>
<li>校验<ul>
<li>通过某个控件值的比较，来作为判断标准</li>
<li>传入其他控件的<code>key</code>，通过常用比较<code>&gt;</code>/<code>&gt;=</code>/<code>==</code>等，来控制显示</li>
</ul>
</li>
<li>条件（只能二选一），作为以上校验的叠加方式选择<ul>
<li>‘&amp;&amp;’: 与，需同时满足多个条件</li>
<li>‘||’: 或，满足其中一个条件即可</li>
</ul>
</li>
</ul>
<p>通过以上我们可以定义基本配置接口结构：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 校验配置</span></div><div class="line"><span class="keyword">export</span> interface IHiddenValidate &#123;</div><div class="line">    <span class="attr">key</span>: string;</div><div class="line">    validate: string;</div><div class="line">    param: string | number;</div><div class="line">&#125;</div><div class="line"><span class="comment">// 条件配置</span></div><div class="line"><span class="keyword">export</span> interface IHiddenCondition &#123;</div><div class="line">    <span class="attr">condition</span>: <span class="string">'||'</span> | <span class="string">'&amp;&amp;'</span>;</div><div class="line">    validations: IHiddenValidate[];</div><div class="line">&#125;</div><div class="line"><span class="comment">// 自定义单个控件配置</span></div><div class="line"><span class="keyword">export</span> interface ICustomControl &#123;</div><div class="line">    <span class="attr">type</span>: string;</div><div class="line">    label: string;</div><div class="line">    key: string;</div><div class="line">    validations?: IValidations[];</div><div class="line">    options?: IOptions[];</div><div class="line">    limit?: ILimit;</div><div class="line">    hiddenWhen?: IHiddenCondition;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<h3 id="条件判断"><a href="#条件判断" class="headerlink" title="条件判断"></a>条件判断</h3><p>我们针对上面的数据结构，需要进行条件判断，返回布尔值来控制表单的显示或隐藏。</p>
<p>首先，我们添加一个用于计算条件的函数：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">export</span> <span class="function"><span class="keyword">function</span> <span class="title">validate</span>(<span class="params">a, b, condition</span>): <span class="title">boolean</span> </span>&#123;</div><div class="line">    <span class="keyword">switch</span> (condition) &#123;</div><div class="line">        <span class="keyword">case</span> <span class="string">'&gt;'</span>:</div><div class="line">            <span class="keyword">return</span> a &gt; b;</div><div class="line">        <span class="keyword">case</span> <span class="string">'&gt;='</span>:</div><div class="line">            <span class="keyword">return</span> a &gt;= b;</div><div class="line">        <span class="keyword">case</span> <span class="string">'=='</span>:</div><div class="line">            <span class="keyword">return</span> a == b;</div><div class="line">        <span class="keyword">case</span> <span class="string">'==='</span>:</div><div class="line">            <span class="keyword">return</span> a === b;</div><div class="line">        <span class="keyword">case</span> <span class="string">'&gt;'</span>:</div><div class="line">            <span class="keyword">return</span> a &gt; b;</div><div class="line">        <span class="keyword">case</span> <span class="string">'&gt;='</span>:</div><div class="line">            <span class="keyword">return</span> a &gt;= b;</div><div class="line">        <span class="keyword">case</span> <span class="string">'&amp;&amp;'</span>:</div><div class="line">            <span class="keyword">return</span> a &amp;&amp; b;</div><div class="line">        <span class="keyword">case</span> <span class="string">'||'</span>:</div><div class="line">            <span class="keyword">return</span> a || b;</div><div class="line">        <span class="keyword">case</span> <span class="string">'indexOf'</span>: <span class="comment">// 用于数组判断</span></div><div class="line">            <span class="keyword">return</span> a.indexOf(b) &gt; <span class="number">-1</span>;</div><div class="line">        <span class="keyword">default</span>:</div><div class="line">            <span class="keyword">return</span> <span class="literal">true</span>;</div><div class="line">    &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>然后我们开始处理较复杂的条件和校验，先将多个校验计算出来，再使用条件合并：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div></pre></td><td class="code"><pre><div class="line">isHidden(control: ICustomControl) &#123;</div><div class="line">    <span class="keyword">let</span> hidden = <span class="literal">false</span>; <span class="comment">// 初始化显示</span></div><div class="line">    <span class="keyword">if</span> (control.hiddenWhen &amp;&amp; control.hiddenWhen.validations &amp;&amp; control.hiddenWhen.validations.length) &#123;</div><div class="line">        control.hiddenWhen.validations.forEach(<span class="function"><span class="params">valid</span> =&gt;</span> &#123;</div><div class="line">            <span class="comment">// 条件计算</span></div><div class="line">            hidden = validate(</div><div class="line">                hidden,</div><div class="line">                validate(<span class="keyword">this</span>.dynamicForm.value[valid.key], valid.param, valid.validate), <span class="comment">// 校验计算</span></div><div class="line">                control.hiddenWhen.condition</div><div class="line">            );</div><div class="line">        &#125;);</div><div class="line">    &#125;</div><div class="line">    <span class="keyword">return</span> hidden;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>通过这个方法我们就能控制是否显示对应表单控件了：</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">div</span> *<span class="attr">ngFor</span>=<span class="string">"let control of config"</span> <span class="attr">class</span>=<span class="string">"form-group"</span>&gt;</span></div><div class="line">    <span class="tag">&lt;<span class="name">div</span> *<span class="attr">ngIf</span>=<span class="string">"!isHidden(control)"</span>&gt;</span></div><div class="line">        <span class="comment">&lt;!--具体控件--&gt;</span></div><div class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></div><div class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></div></pre></td></tr></table></figure>
<h3 id="实例配置"><a href="#实例配置" class="headerlink" title="实例配置"></a>实例配置</h3><p>我们可以通过一个简单的邮件接收配置来检验：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">export</span> <span class="keyword">const</span> customForms: ICustomControl[] = [</div><div class="line">    &#123;</div><div class="line">        <span class="attr">type</span>: <span class="string">'radio'</span>,</div><div class="line">        <span class="attr">label</span>: <span class="string">'是否接收邮件'</span>,</div><div class="line">        <span class="attr">key</span>: <span class="string">'emailReceived'</span>,</div><div class="line">        <span class="attr">options</span>: [</div><div class="line">            &#123;<span class="attr">id</span>: <span class="string">'1'</span>, <span class="attr">text</span>: <span class="string">'是'</span>&#125;,</div><div class="line">            &#123;<span class="attr">id</span>: <span class="string">'0'</span>, <span class="attr">text</span>: <span class="string">'否'</span>&#125;</div><div class="line">        ]</div><div class="line">    &#125;, &#123;</div><div class="line">        <span class="attr">type</span>: <span class="string">'text'</span>,</div><div class="line">        <span class="attr">label</span>: <span class="string">'Email'</span>,</div><div class="line">        <span class="attr">key</span>: <span class="string">'email'</span>,</div><div class="line">        <span class="attr">validations</span>: [&#123;</div><div class="line">            <span class="attr">type</span>: <span class="string">'email'</span>,</div><div class="line">            <span class="attr">message</span>: <span class="string">'Email格式不正确'</span></div><div class="line">        &#125;],</div><div class="line">        <span class="attr">hiddenWhen</span>: &#123;</div><div class="line">            <span class="attr">condition</span>: <span class="string">'||'</span>,</div><div class="line">            <span class="attr">validations</span>: [&#123;</div><div class="line">                <span class="attr">key</span>: <span class="string">'emailReceived'</span>,</div><div class="line">                <span class="attr">validate</span>: <span class="string">'=='</span>,</div><div class="line">                <span class="attr">param</span>: <span class="string">'0'</span></div><div class="line">            &#125;]</div><div class="line">        &#125;</div><div class="line">    &#125;</div><div class="line">];</div></pre></td></tr></table></figure>
<p>效果如下：</p>
<p><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/1496326365%281%29.png" alt="iamge"><br><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/1496326383%281%29.png" alt="iamge"></p>
<h2 id="带输入的选择"><a href="#带输入的选择" class="headerlink" title="带输入的选择"></a>带输入的选择</h2><hr>
<p>很多时候我们需要有这样的表单控件：</p>
<ul>
<li>checkbox勾选后可自定义填写</li>
<li>radio选择自定义填写</li>
</ul>
<p>这里我们简单做个组件封装吧。</p>
<h3 id="带输入的checkbox"><a href="#带输入的checkbox" class="headerlink" title="带输入的checkbox"></a>带输入的checkbox</h3><p>我们先来定义我们想要的效果：</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">span</span> *<span class="attr">ngFor</span>=<span class="string">"let op of options"</span> <span class="attr">class</span>=<span class="string">"form-check"</span>&gt;</span></div><div class="line">    <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"checkbox"</span> [<span class="attr">name</span>]=<span class="string">"value"</span> [<span class="attr">checked</span>]=<span class="string">"model[op.id] &amp;&amp; model[op.id].checked"</span></span></div><div class="line">           (<span class="attr">click</span>)=<span class="string">"setValue(op)"</span> [<span class="attr">disabled</span>]=<span class="string">"disabled"</span> [<span class="attr">value</span>]=<span class="string">"op.id"</span>/&gt;&#123;&#123;op.text&#125;&#125;</div><div class="line">    <span class="tag">&lt;<span class="name">input</span> *<span class="attr">ngIf</span>=<span class="string">"op.withInput"</span> <span class="attr">class</span>=<span class="string">"form-control form-inline-input"</span></span></div><div class="line">           [<span class="attr">type</span>]=<span class="string">"type"</span> [<span class="attr">disabled</span>]=<span class="string">"!(model[op.id] &amp;&amp; model[op.id].checked)"</span> [(<span class="attr">ngModel</span>)]=<span class="string">"model[op.id].value"</span>/&gt;</div><div class="line"><span class="tag">&lt;/<span class="name">span</span>&gt;</span></div></pre></td></tr></table></figure>
<p>由于多了自定义填写，通过绑定选中数组的形式也不适用了，我们需要通过对象的方式来绑定返回值：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// 这里为了方便表达清楚结构，使用了不合规范的表示，莫介意</span></div><div class="line">model = &#123;</div><div class="line">    <span class="attr">id</span>: &#123;</div><div class="line">        <span class="attr">checked</span>: boolen,</div><div class="line">        <span class="attr">value</span>: string | number</div><div class="line">    &#125;</div><div class="line">&#125;;</div></pre></td></tr></table></figure>
<p>用的实现还是前面自定义表单的那一套：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div></pre></td><td class="code"><pre><div class="line">@Component(&#123;</div><div class="line">    <span class="attr">selector</span>: <span class="string">'checkbox-with-input'</span>,</div><div class="line">    <span class="attr">template</span>: <span class="string">`...同上`</span>,</div><div class="line">    <span class="attr">providers</span>: [customInputAccessor(CheckboxWithTextComponent)]</div><div class="line">&#125;)</div><div class="line"><span class="keyword">export</span> <span class="class"><span class="keyword">class</span> <span class="title">CheckboxWithTextComponent</span> <span class="title">implements</span> <span class="title">OnInit</span> </span>&#123;</div><div class="line">    @Input() options: IOptions[] = []; <span class="comment">// object: &#123;id, text&#125; or array: []</span></div><div class="line">    @Input() disabled: boolean = <span class="literal">false</span>;</div><div class="line">    @Input() type: string = <span class="string">'text'</span>;</div><div class="line"></div><div class="line">    private model: any = &#123;&#125;; <span class="comment">// 控件的值</span></div><div class="line">    private onChange: <span class="function">(<span class="params">_: any</span>) =&gt;</span> <span class="keyword">void</span>;</div><div class="line">    private onTouched: <span class="function"><span class="params">()</span> =&gt;</span> <span class="keyword">void</span>;</div><div class="line"></div><div class="line">    ngOnInit() &#123;</div><div class="line">        <span class="comment">// 初始化model的值</span></div><div class="line">        <span class="keyword">this</span>.options.forEach(<span class="function"><span class="params">op</span> =&gt;</span> &#123;</div><div class="line">            <span class="keyword">this</span>.model[op.id] = &#123;</div><div class="line">                <span class="attr">checked</span>: <span class="literal">false</span>,</div><div class="line">            &#125;;</div><div class="line">            <span class="keyword">if</span> (op.withInput) &#123;</div><div class="line">                <span class="keyword">this</span>.model[op.id].value = <span class="string">''</span>;</div><div class="line">            &#125;</div><div class="line">        &#125;);</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    setValue(op: any) &#123;</div><div class="line">        <span class="comment">// 选择某选项的时候处理</span></div><div class="line">        <span class="keyword">const</span> isChecked = !<span class="keyword">this</span>.model[op.id].checked;</div><div class="line">        <span class="keyword">this</span>.model[op.id].checked = isChecked;</div><div class="line">        <span class="keyword">this</span>.onChange(<span class="keyword">this</span>.model);</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    <span class="comment">// 下面的方法参照前面几节</span></div><div class="line">    <span class="comment">// onBlur</span></div><div class="line">    <span class="comment">// writeValue</span></div><div class="line">    <span class="comment">// registerOnChange</span></div><div class="line">    <span class="comment">// registerOnTouched</span></div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>然后我们在动态表单里面添加进去：</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">checkbox-with-input</span> *<span class="attr">ngIf</span>=<span class="string">"control.type === 'checkbox-with-text'"</span> <span class="attr">type</span>=<span class="string">"text"</span> [<span class="attr">options</span>]=<span class="string">"control.options"</span> [<span class="attr">formControlName</span>]=<span class="string">"control.key"</span>&gt;</span><span class="tag">&lt;/<span class="name">checkbox-with-input</span>&gt;</span></div><div class="line"><span class="tag">&lt;<span class="name">checkbox-with-input</span> *<span class="attr">ngIf</span>=<span class="string">"control.type === 'checkbox-with-number'"</span> <span class="attr">type</span>=<span class="string">"number"</span> [<span class="attr">options</span>]=<span class="string">"control.options"</span> [<span class="attr">formControlName</span>]=<span class="string">"control.key"</span>&gt;</span><span class="tag">&lt;/<span class="name">checkbox-with-input</span>&gt;</span></div></pre></td></tr></table></figure>
<p>而带输入的<code>radio</code>大家就自己解决吧，本骚年的项目代码里面有，基本与checkbox的很相像。</p>
<p>结合上面，最终我们的效果图如下：</p>
<p><img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/1496325904%281%29.png" alt="image"></p>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>这里我们只针对简单的条件进行表单校验，并且这里只能匹配一些简单绑定的值，像多选等因为绑定的值为对象，暂无法进行条件判断。<br>一些复杂的控制功能或许需要我们通过其他方式进行吧，毕竟很多时候更广的通用性也会增加设计的复杂度、消耗使用的简便性。<br><a href="https://github.com/godbasin/godbasin.github.io/tree/blog-codes/angular2-free/10-add-conditions" target="_blank" rel="external">此处查看项目代码</a><br><a href="http://angular2-free.godbasin.com/10-add-conditions/index.html#/home/page-setting" target="_blank" rel="external">此处查看页面效果</a></p>
  
		
		<p style="margin-top:50px;">查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a></p>
	</div>
	<img src="https://github-imglib-1255459943.cos.ap-chengdu.myqcloud.com/2code2.jpg" width="200" height="200" style="display:block;margin: 0 auto;" />
	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
	<div class="author-right">
  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
	</div>
		<footer class="article-footer clearfix">

  <div class="article-tags">
  
  <span></span> <a href="/tags/笔记/">笔记</a>
  </div>


<div class="article-categories">
  <span></span>
  <a class="article-category-link" href="/categories/angular2火锅/">angular2火锅</a>
</div>



<div class="article-share" id="share">

  
<!-- JiaThis Button BEGIN -->
<div class="jiathis_style_24x24">
	<a class="jiathis_button_qzone"></a>
	<a class="jiathis_button_tsina"></a>
	<a class="jiathis_button_tqq"></a>
	<a class="jiathis_button_weixin"></a>
	<a class="jiathis_button_renren"></a>
	<a href="http://www.jiathis.com/share?uid=2134021" class="jiathis jiathis_txt jtico jtico_jiathis" target="_blank"></a>
</div>
<script type="text/javascript">
var jiathis_config = {data_track_clickback:'true'};
</script>
<script type="text/javascript" src="http://v3.jiathis.com/code_mini/jia.js?uid=2134021" charset="utf-8"></script>
<!-- JiaThis Button END -->   


</div>
</footer>   	       
	</article>
	
<nav class="article-nav clearfix">
 
 <div class="prev" >
 <a href="/2017/06/24/angular2-free-11-option-dialog/" title="玩转Angular2(11)--使用动态表单制作选项配置对话框">
  <strong>PREVIOUS:</strong><br/>
  <span>
  玩转Angular2(11)--使用动态表单制作选项配置对话框</span>
</a>
</div>


<div class="next">
<a href="/2017/06/11/angular2-free-9-upload-iamge/"  title="玩转Angular2(9)--图片上传控件">
 <strong>NEXT:</strong><br/> 
 <span>玩转Angular2(9)--图片上传控件
</span>
</a>
</div>

</nav>

	<!-- 如果不是首页且没使用 `comments: false` 关闭评论，则尝试加载评论 -->

    <!-- 配置中启用多说时，导入相应代码 -->
    


</div>  
      <div class="openaside"><a class="navbutton" href="#" title="显示侧边栏"></a></div>

  <div id="toc" class="toc-aside">
  <strong class="toc-title">文章目录</strong>
  <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#表单条件"><span class="toc-number">1.</span> <span class="toc-text">表单条件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#常用表单条件"><span class="toc-number">1.1.</span> <span class="toc-text">常用表单条件</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#条件判断"><span class="toc-number">1.2.</span> <span class="toc-text">条件判断</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#实例配置"><span class="toc-number">1.3.</span> <span class="toc-text">实例配置</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#带输入的选择"><span class="toc-number">2.</span> <span class="toc-text">带输入的选择</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#带输入的checkbox"><span class="toc-number">2.1.</span> <span class="toc-text">带输入的checkbox</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">3.</span> <span class="toc-text">结束语</span></a></li></ol>
  </div>

<div id="asidepart">
<div class="closeaside"><a class="closebutton" href="#" title="隐藏侧边栏"></a></div>
<aside class="clearfix">

  	
	<div class="archiveslist">
		<p class="asidetitle">最近文章</p>
			<ul class="archive-list">
			
					
				<li class="archive-list-item">
					<a class="archive-list-link" href="/2019/07/11/vue-for-everyone-2/" title="9102全员学Vue--2.怎么三两下拼出一个页面">9102全员学Vue--2.怎么三两...</a>
				</li>
				
			
					
				<li class="archive-list-item">
					<a class="archive-list-link" href="/2019/06/30/about-front-end-2-principle/" title="前端这几年--2.工作原则和选择">前端这几年--2.工作原则和选择...</a>
				</li>
				
			
					
				<li class="archive-list-item">
					<a class="archive-list-link" href="/2019/06/27/vue-for-everyone-1/" title="9102全员学Vue--1.如何理解前端和Vue">9102全员学Vue--1.如何理解...</a>
				</li>
				
			
					
				<li class="archive-list-item">
					<a class="archive-list-link" href="/2019/06/17/wxapp-latest-20190617/" title="小程序开发月刊第六期（20190617）">小程序开发月刊第六期（2019061...</a>
				</li>
				
			
					
				<li class="archive-list-item">
					<a class="archive-list-link" href="/2019/06/17/wxapp-generate/" title="小程序的诞生">小程序的诞生</a>
				</li>
				
			
					
				<li class="archive-list-item">
					<a class="archive-list-link" href="/2019/05/15/wxapp-latest-20190515/" title="小程序开发月刊第五期（20190515）">小程序开发月刊第五期（2019051...</a>
				</li>
				
			
					
				<li class="archive-list-item">
					<a class="archive-list-link" href="/2019/04/15/wxapp-latest-20190415/" title="小程序开发月刊第四期（20190415）">小程序开发月刊第四期（2019041...</a>
				</li>
				
			
					
				<li class="archive-list-item">
					<a class="archive-list-link" href="/2019/04/13/about-front-end-1-begin-in/" title="前端这几年--1.转岗之路">前端这几年--1.转岗之路...</a>
				</li>
				
			
					
				<li class="archive-list-item">
					<a class="archive-list-link" href="/2019/03/15/wxapp-latest-20190315/" title="小程序开发月刊第三期（20190315）">小程序开发月刊第三期（2019031...</a>
				</li>
				
			
					
				<li class="archive-list-item">
					<a class="archive-list-link" href="/2019/03/10/work-2-article/" title="写文章这件事">写文章这件事</a>
				</li>
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
				
			
			</ul>
	</div>


  
  <div class="archiveslist">
    <p class="asidetitle"><a href="/archives">归档</a></p>
      <ul class="archive-list"><li class="archive-list-item"><a class="archive-list-link" href="/archives/2019/07/">七月 2019</a><span class="archive-list-count">1</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2019/06/">六月 2019</a><span class="archive-list-count">4</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2019/05/">五月 2019</a><span class="archive-list-count">1</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2019/04/">四月 2019</a><span class="archive-list-count">2</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2019/03/">三月 2019</a><span class="archive-list-count">2</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2019/02/">二月 2019</a><span class="archive-list-count">2</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2019/01/">一月 2019</a><span class="archive-list-count">3</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/12/">十二月 2018</a><span class="archive-list-count">4</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/11/">十一月 2018</a><span class="archive-list-count">4</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/10/">十月 2018</a><span class="archive-list-count">1</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/09/">九月 2018</a><span class="archive-list-count">3</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/08/">八月 2018</a><span class="archive-list-count">2</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/07/">七月 2018</a><span class="archive-list-count">3</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/06/">六月 2018</a><span class="archive-list-count">3</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/05/">五月 2018</a><span class="archive-list-count">5</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/04/">四月 2018</a><span class="archive-list-count">4</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/03/">三月 2018</a><span class="archive-list-count">7</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/02/">二月 2018</a><span class="archive-list-count">4</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/01/">一月 2018</a><span class="archive-list-count">9</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/12/">十二月 2017</a><span class="archive-list-count">5</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/11/">十一月 2017</a><span class="archive-list-count">3</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/10/">十月 2017</a><span class="archive-list-count">5</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/09/">九月 2017</a><span class="archive-list-count">6</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/08/">八月 2017</a><span class="archive-list-count">11</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/07/">七月 2017</a><span class="archive-list-count">9</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/06/">六月 2017</a><span class="archive-list-count">10</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/05/">五月 2017</a><span class="archive-list-count">15</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/04/">四月 2017</a><span class="archive-list-count">7</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/03/">三月 2017</a><span class="archive-list-count">10</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/02/">二月 2017</a><span class="archive-list-count">41</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/01/">一月 2017</a><span class="archive-list-count">6</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/12/">十二月 2016</a><span class="archive-list-count">7</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/11/">十一月 2016</a><span class="archive-list-count">9</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/10/">十月 2016</a><span class="archive-list-count">5</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/09/">九月 2016</a><span class="archive-list-count">7</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/08/">八月 2016</a><span class="archive-list-count">9</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/07/">七月 2016</a><span class="archive-list-count">14</span></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/06/">六月 2016</a><span class="archive-list-count">9</span></li></ul>
  </div>


  
<div class="archiveslist">
	<p class="asidetitle"><a href="/categories">分类</a></p>
		<ul class="archive-list">
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/CSS炒饭/" title="CSS炒饭">CSS炒饭<sup>3</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/D3小馒头/" title="D3小馒头">D3小馒头<sup>8</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/angular2火锅/" title="angular2火锅">angular2火锅<sup>25</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/angular混搭/" title="angular混搭">angular混搭<sup>33</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/box2djs方糖/" title="box2djs方糖">box2djs方糖<sup>34</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/cyclejs哈根达斯/" title="cyclejs哈根达斯">cyclejs哈根达斯<sup>8</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/jQuery杂烩/" title="jQuery杂烩">jQuery杂烩<sup>3</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/js什锦/" title="js什锦">js什锦<sup>26</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/react沙拉/" title="react沙拉">react沙拉<sup>16</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/three-js奶茶/" title="three.js奶茶">three.js奶茶<sup>5</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/vue八宝粥/" title="vue八宝粥">vue八宝粥<sup>28</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/webpack宾治/" title="webpack宾治">webpack宾治<sup>9</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/web乱炖/" title="web乱炖">web乱炖<sup>2</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/前端满汉全席/" title="前端满汉全席">前端满汉全席<sup>8</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/喵/" title="喵">喵<sup>1</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/小程序双皮奶/" title="小程序双皮奶">小程序双皮奶<sup>21</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/工作这杯茶/" title="工作这杯茶">工作这杯茶<sup>4</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/应用巧克力盒/" title="应用巧克力盒">应用巧克力盒<sup>2</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/思想棉花糖/" title="思想棉花糖">思想棉花糖<sup>8</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/柴米油盐工具集/" title="柴米油盐工具集">柴米油盐工具集<sup>1</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/categories/非前端钙片/" title="非前端钙片">非前端钙片<sup>7</sup></a>
			</li>
		
		</ul>
</div>


  
<div class="archiveslist">
	<p class="asidetitle">标签</p>
		<ul class="archive-list">
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/tags/分享/" title="分享">分享<sup>44</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/tags/原创部件/" title="原创部件">原创部件<sup>1</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/tags/心态/" title="心态">心态<sup>4</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/tags/教程/" title="教程">教程<sup>65</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/tags/晒猫/" title="晒猫">晒猫<sup>1</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/tags/笔记/" title="笔记">笔记<sup>121</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/tags/算法/" title="算法">算法<sup>9</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/tags/自制插件/" title="自制插件">自制插件<sup>2</sup></a>
			</li>
		
			<li class="archive-list-item">
				<a class="archive-list-link" href="/tags/逻辑实现/" title="逻辑实现">逻辑实现<sup>5</sup></a>
			</li>
		
		</ul>
</div>


    <div class="archiveslist">
    <p class="asidetitle"><a href="/archives">about</a></p>
      <ul class="archive-list">
      	<li class="archive-list-item">
      		<a>wangbeishan@163.com</a>
      		<a href="https://github.com/godbasin">github.com/godbasin</a>
      	</li>
      </ul>
  </div>

  <div class="rsspart">
	<a href="/atom.xml" target="_blank" title="rss">RSS 订阅</a>
</div>

</aside>
</div>
    </div>
    <footer><div id="footer" >
	
	<section class="info">
		<p> 即使梦想再小，却很伟大 ^_^ </p>
	</section>
	 
		<p class="copyright">Powered by <a href="http://hexo.io" target="_blank" title="hexo">hexo</a> and Theme by <a href="https://github.com/A-limon/pacman" target="_blank" title="Pacman">Pacman</a> © 2019 
		
		<a href="https://godbasin.github.io" target="_blank" title="被删">被删</a>
		
		</p>
</div>
</footer>
    <script src="/js/jquery-2.1.0.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){ 
  $('.navbar').click(function(){
    $('header nav').toggleClass('shownav');
  });
  var myWidth = 0;
  function getSize(){
    if( typeof( window.innerWidth ) == 'number' ) {
      myWidth = window.innerWidth;
    } else if( document.documentElement && document.documentElement.clientWidth) {
      myWidth = document.documentElement.clientWidth;
    };
  };
  var m = $('#main'),
      a = $('#asidepart'),
      c = $('.closeaside'),
      o = $('.openaside');
  $(window).resize(function(){
    getSize(); 
    if (myWidth >= 1024) {
      $('header nav').removeClass('shownav');
    }else
    {
      m.removeClass('moveMain');
      a.css('display', 'block').removeClass('fadeOut');
      o.css('display', 'none');
      
      $('#toc.toc-aside').css('display', 'none');
        
    }
  });
  c.click(function(){
    a.addClass('fadeOut').css('display', 'none');
    o.css('display', 'block').addClass('fadeIn');
    m.addClass('moveMain');
  });
  o.click(function(){
    o.css('display', 'none').removeClass('beforeFadeIn');
    a.css('display', 'block').removeClass('fadeOut').addClass('fadeIn');      
    m.removeClass('moveMain');
  });
  $(window).scroll(function(){
    o.css("top",Math.max(80,260-$(this).scrollTop()));
  });
});
</script>

<script type="text/javascript">
$(document).ready(function(){ 
  var ai = $('.article-content>iframe'),
      ae = $('.article-content>embed'),
      t  = $('#toc'),
      h  = $('article h2')
      ah = $('article h2'),
      ta = $('#toc.toc-aside'),
      o  = $('.openaside'),
      c  = $('.closeaside');
  if(ai.length>0){
    ai.wrap('<div class="video-container" />');
  };
  if(ae.length>0){
   ae.wrap('<div class="video-container" />');
  };
  if(ah.length==0){
    t.css('display','none');
  }else{
    c.click(function(){
      ta.css('display', 'block').addClass('fadeIn');
    });
    o.click(function(){
      ta.css('display', 'none');
    });
    $(window).scroll(function(){
      ta.css("top",Math.max(140,320-$(this).scrollTop()));
    });
  };
});
</script>







  </body>
</html>
